ProFilter Air Filter Ready To Use (AFR 2007 00) Air Filter Part Number:AFR 2007 00 optimum noise damping and low Site US optimum noise damping and low wear are just as much taken for granted as gentle clutch engagement and disengagement and gear shifting NGK Racing Spark Plugs feature electrode materials and configurations as follows: Electrode materials Many use precious metals such as platinum or gold palladium for greater durability and lower voltage requirements reticulated foam The dual foam layers differ in foam pore size the innermost foam consists of a more dense foam to catch fine particles of sand and powder